write tag lib in progress

2 files changed, 119 insertions, 16 deletions

diff --git a/utils/storage/tag_utility.cpp b/utils/storage/tag_utility.cpp
index 03b8bbc..af4dda8 100644
--- a/utils/storage/tag_utility.cpp
+++ b/utils/storage/tag_utility.cpp
@@ -1,3 +1,4 @@
+#include <assert.h>
 #include <glib.h>
 #include "tag_utility.h"
 
@@ -5,23 +6,123 @@
 /* internal taglib structure */
 struct tag_entry{
     int m_line_type;
-    const char * m_line_tag;
+    char * m_line_tag;
     int m_num_of_values;
-    const char ** m_required_tags;
-    /* const char ** m_optional_tags; */
+    char ** m_required_tags;
+    /* char ** m_optional_tags; */
     /* int m_optional_count = 0; */
-    const char ** m_ignored_tags;
-
-public:
-    tag_entry(int line_type, const char * line_tag, int num_of_values,
-              const char * required_tags[], const char * ignored_tags[]){
-        m_line_type = line_type; m_line_tag = line_tag;
-        m_num_of_values = num_of_values;
-        m_required_tags = required_tags;
-        m_ignored_tags = ignored_tags;
-    }
+    char ** m_ignored_tags;
 };
 
+tag_entry tag_entry_copy(int line_type, const char * line_tag,
+                         int num_of_values,
+                         char * required_tags[],
+                         char * ignored_tags[]){
+    tag_entry entry;
+    entry.m_line_type = line_type;
+    entry.m_line_tag = g_strdup( line_tag );
+    entry.m_num_of_values = num_of_values;
+    entry.m_required_tags = g_strdupv( required_tags );
+    entry.m_ignored_tags = g_strdupv( ignored_tags );
+    return entry;
+}
+
+tag_entry tag_entry_clone(tag_entry * entry){
+    return tag_entry_copy(entry->m_line_type, entry->m_line_tag,
+                          entry->m_num_of_values,
+                          entry->m_required_tags, entry->m_ignored_tags);
+}
+
+void tag_entry_reclaim(tag_entry * entry){
+    g_free( entry->m_line_tag );
+    g_strfreev( entry->m_required_tags );
+    g_strfreev(entry->m_ignored_tags);
+}
+
+static bool taglib_free_tag_array(GArray * tag_array){
+    for ( size_t i = 0; i < tag_array->len; ++i) {
+        tag_entry * entry = &g_array_index(tag_array, tag_entry, i);
+        tag_entry_reclaim(entry);
+    }
+    g_array_free(tag_array, TRUE);
+    return true;
+}
+
+/* Pointer Array of Array of tag_entry */
+static GPtrArray * g_tagutils_stack = NULL;
+
+bool taglib_init(){
+    assert( g_tagutils_stack == NULL);
+    g_tagutils_stack = g_ptr_array_new();
+    GArray * tag_array = g_array_new(TRUE, TRUE, sizeof(tag_entry));
+    g_ptr_array_add(g_tagutils_stack, tag_array);
+    return true;
+}
+
+bool taglib_add_tag(int line_type, const char * line_tag, int num_of_values,
+                    const char * required_tags[], const char * ignored_tags[]){
+    GArray * tag_array = (GArray *) g_ptr_array_index(g_tagutils_stack,
+                                     g_tagutils_stack->len - 1);
+    tag_entry entry = tag_entry_copy(line_type, line_tag, num_of_values,
+                                     (char **)required_tags,
+                                     (char **)ignored_tags);
+    /* TODO: maybe also do some duplicate tagname or line_type check here. */
+    g_array_append_val(tag_array, entry);
+    return true;
+}
+
+bool taglib_read(const char * input_line, int & line_type, GPtrArray * values,
+                 GHashTable * required){
+    /* TODO: implement this. */
+    assert(false);
+    /* use own version of string split
+       instead of g_strsplit for special token.*/
+}
+
+bool taglib_remove_tag(int line_type){
+    /* Note: duplicate entry check is in taglib_add_tag. */
+    GArray * tag_array = (GArray *) g_ptr_array_index(g_tagutils_stack, g_tagutils_stack->len - 1);
+    for ( size_t i = 0; i < tag_array->len; ++i) {
+        tag_entry * entry = &g_array_index(tag_array, tag_entry, i);
+        if (entry->m_line_type != line_type)
+            continue;
+        tag_entry_reclaim(entry);
+        g_array_remove_index(tag_array, i);
+        return true;
+    }
+    return false;
+}
+
+bool taglib_push_state(){
+    assert(g_tagutils_stack->len >= 1);
+    GArray * next_tag_array = g_array_new(TRUE, TRUE, sizeof(tag_entry));
+    GArray * prev_tag_array = (GArray *) g_ptr_array_index(g_tagutils_stack, g_tagutils_stack->len - 1);
+    for ( size_t i = 0; i < prev_tag_array->len; ++i) {
+        tag_entry * entry = &g_array_index(prev_tag_array, tag_entry, i);
+        tag_entry new_entry = tag_entry_clone(entry);
+        g_array_append_val(next_tag_array, new_entry);
+    }
+    g_ptr_array_add(g_tagutils_stack, next_tag_array);
+    return true;
+}
+
+bool taglib_pop_state(){
+    assert(g_tagutils_stack->len > 1);
+    GArray * tag_array = (GArray *) g_ptr_array_index(g_tagutils_stack, g_tagutils_stack->len - 1);
+    g_ptr_array_remove_index(g_tagutils_stack, g_tagutils_stack->len - 1);
+    taglib_free_tag_array(tag_array);
+    return true;
+}
+
+bool taglib_fini(){
+    for ( size_t i = 0; i < g_tagutils_stack->len; ++i){
+        GArray * tag_array = (GArray *) g_ptr_array_index(g_tagutils_stack, i);
+        taglib_free_tag_array(tag_array);
+    }
+    g_ptr_array_free(g_tagutils_stack, TRUE);
+    return true;
+}
+
 void test(){
     TAGLIB_BEGIN_ADD_TAG(1, "\\data", 0);
     TAGLIB_REQUIRED_TAGS = {"model", NULL};
diff --git a/utils/storage/tag_utility.h b/utils/storage/tag_utility.h
index 38a5bf8..fd5e89e 100644
--- a/utils/storage/tag_utility.h
+++ b/utils/storage/tag_utility.h
@@ -31,7 +31,9 @@ bool taglib_init();
 /* Note: most string array (const char *) are null pointer terminated. */
 bool taglib_add_tag(int line_type, const char * line_tag, int num_of_values, const char * required_tags[], const char * ignored_tags[]);
 
-/* most parameters are hash table of string (const char *). */
+/* most parameters are hash table of string (const char *).
+ * "..." special token handling is also omitted from the first implementation.
+ */
 bool taglib_read(const char * input_line, int & line_type, GPtrArray * values, GHashTable * required);
 
 /* Note: taglib_write is omited, as printf is more suitable for this. */
@@ -57,9 +59,9 @@ bool taglib_fini();
 
 #define TAGLIB_BEGIN_ADD_TAG(line_type, line_tag, num_of_values)        \
     {                                                                   \
-        const int line_type_saved = line_type;                          \
+        int line_type_saved = line_type;                          \
         const char * line_tag_saved = line_tag;                         \
-        const int num_of_values_saved = num_of_values;                  \
+        int num_of_values_saved = num_of_values;                  \
         ;
 
 #define TAGLIB_REQUIRED_TAGS const char * required_tags_saved[]